Abstract: For suppression of continuous wave interferers at, e.g., up to four interferer frequencies (f1, f2, f3, f4) in a GNSS receiver base band circuit a raw digital signal is, in a band stop unit (21), shifted, by a first mixer (31a), by the negative of the first interferer frequency (f1) in the frequency domain whereupon the continuous wave interferer is suppressed by a band stop filter (30a), a linear phase FIR filter with a suppression band centered at zero, e.g., a filter subtracting a mean over previous subsequent signal values from the actual signal value. After further shifting of the shifted digital signal by the negative of the difference between the second interferer frequency (f2) and the first interferer frequency (f1) the shifted digital signal is again filtered by an identical band stop filter (30b) and so on.

Abstract: For suppression of continuous wave interferers at, e.g., up to four interferer frequencies (f1, f2, f3, f4) in a GNSS receiver base band circuit a raw digital signal is, in a band stop unit (21), shifted, by a first mixer (31a), by the negative of the first interferer frequency (f1) in the frequency domain whereupon the continuous wave interferer is suppressed by a band stop filter (30a), a linear phase FIR filter with a suppression band centered at zero, e.g., a filter subtracting a mean over previous subsequent signal values from the actual signal value. After further shifting of the shifted digital signal by the negative of the difference between the second interferer frequency (f2) and the first interferer frequency (f1) the shifted digital signal is again filtered by an identical band stop filter (30b) and so on.

Abstract: For suppression of continuous wave interferers at, e.g., up to four interferer frequencies (f1, f2, f3, f4) in a GNSS receiver base band circuit a raw digital signal is, in a band stop unit (21), shifted, by a first mixer (31a), by the negative of the first interferer frequency (f1) in the frequency domain whereupon the continuous wave interferer is suppressed by a band stop filter (30a), a linear phase FIR filter with a suppression band centered at zero, e.g., a filter subtracting a mean over previous subsequent signal values from the actual signal value. After further shifting of the shifted digital signal by the negative of the difference between the second interferer frequency (f2) and the first interferer frequency (f1) the shifted digital signal is again filtered by an identical band stop filter (30b) and so on.

Abstract: An analog die (3) and a digital die (4) are supported by a plate (1) consisting of an electrically conductive material. Pads (5) of the dies (3, 4) are connected to each other, to plate (1) or to pins (2) surrounding the latter by bond wires (6). The upper side of the plate (1) is covered by a plastic mold (7) encapsulating the dies (3, 4), the bond wires (6) and, in part, the pins (2). For the suppression of external jamming signals as well as internal ones picked up by bond wires the digital die (4) comprises an adjustable notch filter which suppresses narrow frequency bands where jamming signals have been detected.

Abstract: For suppression of continuous wave interferers at, e.g., up to four interferer frequencies (f1, f2, f3, f4) in a GNSS receiver base band circuit a raw digital signal is, in a band stop unit (21), shifted, by a first mixer (31a), by the negative of the first interferer frequency (f1) in the frequency domain whereupon the continuous wave interferer is suppressed by a band stop filter (30a), a linear phase FIR filter with a suppression band centered at zero, e.g., a filter subtracting a mean over previous subsequent signal values from the actual signal value. After further shifting of the shifted digital signal by the negative of the difference between the second interferer frequency (f2) and the first interferer frequency (f1) the shifted digital signal is again filtered by an identical band stop filter (30b) and so on.

Abstract: An analog die (3) and a digital die (4) are supported by a plate (1) consisting of an electrically conductive material. Pads (5) of the dies (3, 4) are connected to each other, to plate (1) or to pins (2) surrounding the latter by bond wires (6). The upper side of the plate (1) is covered by a plastic mold (7) encapsulating the dies (3, 4), the bond wires (6) and, in part, the pins (2). For the suppression of external jamming signals as well as internal ones picked up by bond wires the digital die (4) comprises an adjustable notch filter which suppresses narrow frequency bands where jamming signals have been detected.

Abstract: A demodulator for angle modulated signals having a carrier frequency includes a demodulation channel provided with a local oscillator and with an channel output for supplying angle modulated output signals. A frequency error detector is coupled to the channel output for deriving a local oscillator frequency error signal. A frequency error corrector has two inputs and an output for providing the frequency error corrected angle modulated signals, one input whereof is coupled to the channel output, whereas its other input is coupled to the frequency error detector. The frequency error corrector is embodied as a complex plane rotator for providing complex angle modulated signals by complex plane rotation of a representation of the angle modulated signals and the local oscillator frequency error signals. Advantageously an easy implementable demodulator for Soft Decision Information demodulation schemes is provided.

Abstract: A data receiver comprises a receiver for receiving a data signal and providing a base band output, a demodulator coupled to an output of the receiving means receiver for providing a data output, and a clock recovery circuit coupled to an output of the demodulator for recovering symbols represented by the data output. The clock recovery circuit is operable to determine a time difference between rising and falling edges in the data output and their nominal reference points, and to determine respective clock reference points for the rising and falling edges from the time difference between the rising and falling edges.